SK, SKE and SKP adaptive system roller shutters are designed mainly for retro-fitting. The advantage of these products is their suitability for retro-fitting, as they do not require special preparations for installation and are not integrated with a particular window. Therefore, the decision to install adaptive system roller shutters may be taken at any given time. These systems may be fitted into window joinery (in a niche) or directly onto walls. In the first case, half-oval SKP boxes are recommended, as they provide a perfect combination with the front elevation, or SK and SKE systems (together with an extruded box), in which the box is bevelled at a 45° angle.